Results 31 to 40 of about 2,118,889 (347)

Worldline geometries for scattering amplitudes

Journal of High Energy Physics
In this paper, we construct the path integral for infinite and semi-infinite scalar worldlines. We show that, at the asymptotic endpoints, on-shell physical states can be generated by inserting vertex operators at infinity.
Roberto Bonezzi, Maria Foteini Kallimani
doaj   +3 more sources

Entropy bound and unitarity of scattering amplitudes [PDF]

Journal of High Energy Physics, 2021
We establish that unitarity of scattering amplitudes imposes universal entropy bounds. The maximal entropy of a self-sustained quantum field object of radius R is equal to its surface area and at the same time to the inverse running coupling α evaluated ...
Gia Dvali
doaj   +2 more sources

Positivity properties of scattering amplitudes

Journal of High Energy Physics
We investigate positivity properties in quantum field theory (QFT). We provide evidence, and in some case proofs, that many building blocks of scattering amplitudes, and in some cases the full amplitudes, satisfy an infinite number of positivity ...
Johannes Henn, Prashanth Raman
doaj   +3 more sources

Learning the simplicity of scattering amplitudes

SciPost Physics
The simplification and reorganization of complex expressions lies at the core of scientific progress, particularly in theoretical high-energy physics.
Clifford Cheung, Aurélien Dersy, Matthew D. Schwartz
doaj   +3 more sources

Scattering amplitudes for self-force [PDF]

Classical and quantum gravity, 2023
The self-force expansion allows the study of deviations from geodesic motion due to the emission of radiation and its consequent back-reaction. We investigate this scheme within the on-shell framework of semiclassical scattering amplitudes for particles ...
T. Adamo, A. Cristofoli, A. Ilderton, Sonja Klisch   +3 more
semanticscholar   +1 more source

Scattering amplitudes from dispersive iterations of unitarity [PDF]

Journal of High Energy Physics, 2023
We present and numerically implement a computational method to construct relativistic scattering amplitudes that obey analyticity, crossing, elastic and inelastic unitarity in three and four spacetime dimensions.
Piotr Tourkine, A. Zhiboedov
semanticscholar   +1 more source

The SAGEX review on scattering amplitudes Chapter 2: An invitation to color-kinematics duality and the double copy [PDF]

Journal of Physics A: Mathematical and Theoretical, 2022
Advances in scattering amplitudes have exposed previously-hidden color-kinematics and double-copy structures in theories ranging from gauge and gravity theories to effective field theories such as chiral perturbation theory and the Born–Infeld model ...
Z. Bern, J. J. Carrasco, M. Chiodaroli, H. Johansson, R. Roiban   +4 more
semanticscholar   +1 more source

The SAGEX review on scattering amplitudes Chapter 14: Classical gravity from scattering amplitudes [PDF]

Journal of Physics A: Mathematical and Theoretical, 2022
Scattering amplitudes have their origin in quantum field theory, but have wide-ranging applications extending to classical physics. We review a formalism to connect certain classical observables to scattering amplitudes. An advantage of this formalism is
D. Kosower, R. Monteiro, D. O’Connell
semanticscholar   +1 more source

The SAGEX review on scattering amplitudes Chapter 11: Soft Theorems and Celestial Amplitudes [PDF]

Journal of Physics A: Mathematical and Theoretical, 2022
The soft limits of scattering amplitudes have been extensively studied due to their essential role in the computation of physical observables in collider physics.
Tristan McLoughlin, Andrea Puhm, A. Raclariu   +2 more
semanticscholar   +1 more source

Scattering amplitude annihilators [PDF]

Journal of High Energy Physics, 2020
Abstract Several second order differential operators are shown to annihilate the YM and GR tree scattering amplitudes. In particular we prove a conjecture of Loebbert, Mojaza and Plefka from their investigation of a hidden conformal symmetry in GR.
Andrea Nützi, Michael Reiterer
openaire   +6 more sources